# DiagonalOBDII vs Add Text to PDF

The clearest difference is update cadence: DiagonalOBDII at every 2 weeks against Add Text to PDF's every 5 months. Add Text to PDF's advantage is monetization model (free vs freemium) and ratings volume (4 vs 1). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. DiagonalOBDII sells 4 in-app purchases, starting at $12.99 per month and Add Text to PDF sells 2 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for DiagonalOBDII against 5.0 for Add Text to PDF. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

DiagonalOBDII ships an update every 2 weeks, Add Text to PDF every 5 months. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | DiagonalOBDII | Add Text to PDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/diagonalobdii/id6743419784/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/add-text-to-pdf-fill-forms/id6754977883/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 5 months |
| Monetization | Freemium | **Free** |
| Size | 24 MB | 72 MB |
| Requires iOS | 18.1 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Kyle Louderback](https://appshunter.io/developer/1400068218) | [OneRack](https://appshunter.io/developer/1792950973) |

## What reviewers say

### DiagonalOBDII

[App page](https://appshunter.io/ios/app/diagonalobdii/id6743419784)

This app helps mechanics streamline vehicle drive cycles by providing live tracking of emissions monitors and diagnostic trouble codes. It offers precise guidance on drive cycle parameters and instant explanations for trouble codes, ensuring accurate diagnostics and faster vehicle readiness for inspection.

**Highlights:** Live drive cycle monitoring, Immediate DTC identification, Real-time monitor completion verification, Precise drive cycle parameter guidance, Professional, easy-to-navigate dashboard, Instant trouble code explanations

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Diagonal Premium Monthly | $12.99 | per month |
| Diagonal Premium Trial | $12.99 | per month |
| Shop Owner - Monthly | $17.99 | per month |
| Diagonal Premium Yearly | $99.99 | per year |


### Add Text to PDF

[App page](https://appshunter.io/ios/app/add-text-to-pdf-fill-forms/id6754977883)

Effortlessly add text, notes, and signatures to PDF documents and images. Fill out forms, annotate scanned papers, and label photos with a clean, intuitive interface. All your work is automatically saved for easy access and sharing.

**Highlights:** Add text directly on PDF documents, Fill out forms and annotate files, Add text and captions to imported photos, Insert digital signatures, Automatic file saving and organization, Offline, secure, and privacy-friendly

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly Access | $6.99 | per 7 days |
| Pro Yearly Access | $29.99 | per year |


## Frequently asked questions

### Is DiagonalOBDII free?

DiagonalOBDII is free to download, with in-app purchases available.

### Is Add Text to PDF free?

Add Text to PDF is free to download, with in-app purchases available.

### Which has better reviews, DiagonalOBDII or Add Text to PDF?

DiagonalOBDII and Add Text to PDF are both rated 5.0 out of 5 on the App Store, from 1 and 4 ratings respectively.

### Do DiagonalOBDII or Add Text to PDF have ads?

Neither DiagonalOBDII nor Add Text to PDF shows ads.

### Which is updated more often, DiagonalOBDII or Add Text to PDF?

DiagonalOBDII ships an update every 2 weeks, and Add Text to PDF every 5 months. Most recently, DiagonalOBDII was updated on November 4, 2026 and Add Text to PDF on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*